Panic is making an enemy of telephones for Catherine Yeung, the director for equities at Fidelity Investment Management Ltd. in Hong Kong.

“My children hate that BlackBerry,” said Yeung, whose clients have been calling amid two weeks of declines that erased $3 trillion from global stocks. She’s advising calm, noting that profits are rising and shares just got a lot less expensive.

“Being a contrarian and getting in when things seem bad is often a good thing,” she said in an interview today. “The companies we are looking into can still deliver attractive margins. Things are getting cheap.”

Strategists from Goldman Sachs Group Inc. to AMP Capital Investors and JPMorgan Chase & Co. are also telling clients to hang on after losses that began with currencies in Turkey and Argentina spread to developed markets. The Standard & Poor’s 500 Index slid 2.3 percent yesterday, capping its first 5 percent retreat in eight months, while Japan’s Topix index plunged 4.8 percent for its biggest decrease since June.

“We didn’t expect the U.S. would be this weak,” Kathy Matsui, chief Japan strategist for Goldman Sachs in Tokyo, said by e-mail. “Since we do not see sufficient reason to change our fundamental earnings outlook and stock prices have fallen, the market still appears attractive to us.”